APD                     Average Proportional Distance (APD)
APDitem                 Item-Level Average Proportional Distance
                        (APDitem)
APDitemmg               Item-Level Average Proportional Distance for
                        Multiple Groups (APDitemmg)
APDmg                   Average Proportional Distance for multiple
                        groups
aiicor                  Average Inter-Item Correlation with Optional
                        Bootstrap Confidence Intervals
aiicorEigen             First eigenvalue from average inter-item
                        association (Kaiser's formula)
rmsiic                  Root-Mean-Square Inter-Item Correlation (Meyer,
                        1975)
